R.I. Gen. Laws § 31-3-11.1: Permanent registration and plates.

(a) Every vehicle owned by the state of Rhode Island and any fire apparatus for which no fee is assessed shall be issued permanent registration and registration plates. The permanent registration and plates shall remain on the vehicles to which they are assigned without expiration until the vehicle is replaced or disposed of.

(b) This section does not apply to certain vehicles owned by state law enforcement agencies.